Objective: This study was undertaken to examine a possible correlation between clearance or persistence of human papillomavirus (HPV) infection and radiation response in carcinoma of the cervix.
Study design: We reviewed 97 patients with HPV-positive cervical squamous cell carcinoma (International Federation of Gynecology and Obstetrics [FIGO] stage IB-IVA) treated with radiotherapy. Examination of HPV DNA was performed by the polymerase chain reaction-based assay.
Results: Cervical HPV DNA cleared in 42 patients (43.3%) and persisted in 55 patients (56.7%) at the end of irradiation. All of 42 HPV-cleared patients (100.0%) and 50 of 55 HPV-persistent patients (90.9%) had complete response. Of 92 patients with complete response, 20 (21.7%) had local recurrence develop. The recurrence rate was significantly higher in HPV-persisted patients (34.0%) than in HPV-cleared patients (7.1%) ( P = .0016). Univariate analysis demonstrated the significant differences for both 5-year local disease-free survival (LDFS) and overall survival (OAS) between HPV-cleared and HPV-persisted groups. Multivariate analysis showed that persistence of HPV DNA was the most powerful independent predictor for LDFS and OAS compared with other prognostic factors, such as FIGO stage or node swelling.
Conclusion: In HPV-positive cervical carcinoma, persistence of HPV DNA in the cervix at the end of irradiation was highly predictive of LDFS and OAS.